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Here's a small breakdown of additional language features that GMEdit offers on top of GML:

Feature name
What you can do	Instead of what
#args (argument shorthand for pre-2.3)
#args a, b // optional arguments: #args a, b = 4, ?c	var a = argument0, b = argument1; // optional arguments: var a = argument[0]; var b = argument_count > 1 ? argument[1] : 4; var c = argument_count > 2 ? argument[2] : undefined;
Null-conditional operators (??, ?., ?[)
var h = instance_nearest(x, y, obj_enemy) ?.cur_health ?? 0; // (split into two lines to fit GitHub)	var e = instance_nearest(x, y, obj_enemy); var h = e != noone ? e.cur_health : 0;
Null-conditional assignment (??=)
a ??= b;	if (a == undefined) a = b;
Template strings (with expression insertion)
draw_text(5, 5, `health: $hp/$maxhp`);	draw_text(5, 5, my_script( "health: %/%", hp, maxhp));
#import (aliases / packages)
#import variable_instance_get as v_get var v=v_get(id,"x"); // multiple items: #import scr_some_package.* as Pkg Pkg.one(1); return Pkg.two(2);	// [transformed to in saved file] var v=variable_instance_get(id,"x"); // multiple items: scr_some_package_one(1); return scr_some_package_two(2);
Typed local variables (method shorthand)
var v:Grid = new Grid(4, 4); v.set(0, 0, "hi"); var r = v.get(0, 0); enum Some { one, two, sizeof } var v:Some = Some(); v.one = 1; r = v.two;	var v = ds_grid_create(4, 4); ds_grid_set(v, 0, 0, "hi"); var r = ds_grid_get(v, 0, 0); enum Some { one, two, sizeof } var v = array_create(Some.sizeof); v[@Some.one] = 1; r = v[Some.two];
inline functions (pre-2.3)
on_click = #lambda { trace("hi!"); } on_destroy = #lambda { trace("bye!"); }	on_click = scr_obj_test_on_click; on_destroy = scr_obj_test_on_destroy; // ... in scr_obj_test_on_click: trace("hi!"); // ... in scr_obj_test_on_destroy: trace("bye!");
#mfunc (macros with arguments)
#mfunc swap(a, b) { var _z=a;a=b;b=_z;} var a = "1", b = "2"; show_debug_message(a + " " + b); // 1 2 swap(a, b); show_debug_message(a + " " + b); // 2 1	Scripts or manual insertion, depending on the macro.
coroutines (scripts that can be suspended/resumed)
/// array_foreach(array) #gmcr var arr = argument0; var len = array_length_1d(arr); for (var i = 0; i < len; i++) { yield arr[i]; } // used like: var iter = array_foreach(0, myarray); while (array_foreach(iter)) { show_debug_message(iter[0]); }	For practical reasons, you wouldn't do this to yourself